Structural characterization of magnesium-based compounds Mg9Si5 and Mg4Si3Al (superconductor) synthesized under high pressure and high temperature conditions.

Two kinds of magnesium-based compounds Mg9Si5 and Mg4Si3Al have been prepared under high pressure and high temperature (HPHT) conditions of 5 GPa at 900-1100 °C. Single crystal study revealed that Mg9Si5 crystallizes in space group P6(3) (No. 173) with the lattice parameters a = 12.